Template:Infobox chromium

vanadium ← chromium → manganese - ↑ Cr ↓ Mo 24Cr Periodic table
Appearance
silvery metallic
General properties
Name, symbol, number	chromium, Cr, 24
Pronunciation	/ˈkroʊmiəm/ kroh-mee-əm
Element category	transition metal
Group, period, block	6, 4, d
Standard atomic weight	51.9961(6)
Electron configuration	[Ar] 4s13d5
Electrons per shell	2, 8, 13, 1 (Image)
Physical properties
Phase	solid
Density (near r.t.)	7.19 g·cm−3
Liquid density at m.p.	6.3 g·cm−3
Melting point	2180 K, 1907 °C, 3465 °F
Boiling point	2944 K, 2671 °C, 4840 °F
Heat of fusion	21.0 kJ·mol−1
Heat of vaporization	339.5 kJ·mol−1
Molar heat capacity	23.35 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1656 1807 1991 2223 2530 2942
Atomic properties
Oxidation states	6, 5, 4, 3, 2, 1, -1, -2 (strongly acidic oxide)
Electronegativity	1.66 (Pauling scale)
Ionization energies (more)	1st: 652.9 kJ·mol−1
	2nd: 1590.6 kJ·mol−1
	3rd: 2987 kJ·mol−1
Atomic radius	128 pm
Covalent radius	139±5 pm
Miscellanea
Crystal structure	body-centered cubic
Magnetic ordering	AFM (rather: SDW)
Electrical resistivity	(20 °C) 125 nΩ·m
Thermal conductivity	93.9 W·m−1·K−1
Thermal expansion	(25 °C) 4.9 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 5940 m·s−1
Young's modulus	279 GPa
Shear modulus	115 GPa
Bulk modulus	160 GPa
Poisson ratio	0.21
Mohs hardness	8.5
Vickers hardness	1060 MPa
Brinell hardness	1120 MPa
CAS registry number	7440-47-3
Most stable isotopes
Main article: Isotopes of chromium
iso NA half-life DM DE (MeV) DP 50Cr 4.345% > 1.8×1017y εε - 50Ti 51Cr syn 27.7025 d ε - 51V γ 0.320 - 52Cr 83.789% 52Cr is stable with 28 neutrons 53Cr 9.501% 53Cr is stable with 29 neutrons 54Cr 2.365% 54Cr is stable with 30 neutrons

References

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